package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Slf4j
@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    @Transactional
    @Override
    public void addSetmeal(SetmealDTO setmealDTO) {
        // 0.开启事务
        // 1.构造套餐基本信息，保存数据到套餐setmeal表中
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmeal.setStatus(StatusConstant.DISABLE);
        setmealMapper.insert(setmeal);
        log.info("新增套餐成功，套餐id为：{}", setmeal.getId());

        // 2.构造套餐菜品信息，保存数据到套餐菜品关系表setmeal_dish中
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && !setmealDishes.isEmpty()) {
            setmealDishes.forEach(setmealDish -> {
                // 2.1关联套餐id
                setmealDish.setSetmealId(setmeal.getId());
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    @Override
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.page(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Override
    public void updateStatus(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status.equals(StatusConstant.ENABLE)) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishes = dishMapper.getBySetmealId(id);
            if(dishes != null && !dishes.isEmpty()) {
                dishes.forEach(dish -> {
                    if(dish.getStatus().equals(StatusConstant.DISABLE)) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    @Transactional
    @Override
    public void deleteSetmeal(List<Long> ids) {
        // 1.起售中的套餐不能删除
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.selectById(id);
            if(setmeal.getStatus().equals(StatusConstant.ENABLE)) {
                throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        // 2.删除套餐的同时，需要将套餐菜品关系数据删除
        ids.forEach(id -> {
            // 2.1删除套餐表中的数据
            setmealMapper.deleteById(id);
            // 2.2删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(id);
        });
    }

    @Override
    public SetmealVO selectSetmeal(Long id) {
        SetmealVO setmealVO = new SetmealVO();
        Setmeal setmeal = setmealMapper.selectById(id);
        BeanUtils.copyProperties(setmeal, setmealVO);

        List<SetmealDish> setmealDish = setmealDishMapper.selectBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDish);
        return setmealVO;
    }

    @Transactional
    @Override
    public void updateSetmeal(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 1、修改套餐表，执行update
        setmealMapper.update(setmeal);
        // 套餐id
        Long id = setmealDTO.getId();

        // 2、删除套餐和菜品的关联关系，操作setmeal_dish表，执行delete
        setmealDishMapper.deleteBySetmealId(id);

        // 3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && !setmealDishes.isEmpty()) {
            setmealDishes.forEach(setmealDish -> {
                // 2.1关联套餐id
                setmealDish.setSetmealId(id);
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
